Are the Cummins Torque Specs Useful for Engines?

Are the Cummins Torque Specs Useful for Engines?

The torque output specifications for Cummins diesel engines are useful for comparing overall power output between a particular Cummins engine and another engine, with higher-torque engines producing more power. However, the performance of an engine once installed in a vehicle depends heavily on that vehicle's specific features.

The same Cummins diesel engine with a manufacturer-specified torque output can have a different actual output when installed in one type of vehicle versus another. For example, the 6.7-liter Cummins diesel used in the 2015 RAM 3500 pickup truck has a torque output of 800 foot-pounds when paired with an automatic transmission, but it decreases to a maximum torque of 660 foot-pounds in a manual-transmission truck to avoid exceeding the structural capacity of the manual transmission system.